Question

The question given below consists of two statements — an Assertion (labeled as A) and a Reason (labeled as R). Choose the correct option -

A : Symbol ${\mathrm{H}}_2$, means one molecule of hydrogen has two atoms in it.

R : The numeral written on the right bottom side of the symbol denotes the number of atoms in one molecule of a compound.

• A. Both A and R are correct and R is the correct explanation of A
• B. Both A and R are correct and R is not the correct explanation of A.
• C. A is correct but R is incorrect.
• D. A is incorrect but R is correct.
• E. Both A and R are incorrect.

Answer 1

The correct option is A

Both A and R are correct and R is the correct explanation of A

• A compound is a substance made up of two or more elements united chemically in a predetermined mass proportion.
• In a compound, atoms always combine in a fixed ratio.
• For example - ${\mathrm{H}}_2$ represents one molecule of dihydrogen.
• The number two present on the subscript of the dihydrogen represents two atoms of hydrogen.

Hence, Option A is the correct answer.